How to check a link

Threats

Where the real domain sits in an address, why shortened links are risky and why letters are not always what they seem.

“Check the address” is advice everyone repeats and almost nobody explains. There is one specific place to look — and once you know it, the fakes fall apart on their own.

Where the real domain sits

Take an address and break it apart:

here
The real domain is what sits immediately before the first single slash

In https://mybank.com.secure-login.net/signin the real domain is secure-login.net; “mybank.com” is just part of a name someone wrote to the left of it. Everything further left is freely made up.

Read an address right to left up to the first slash. The last two parts before it are whoever owns the page.

The tricks in use

TrickHow it looksWhat to check
A familiar name on the leftbank.com.login-portal.netThe part before the first slash
Look-alike lettersA Cyrillic “а” standing in for a Latin oneThe address looks right, the domain is different
An extra charactermy-bank.com, mybannk.comA hyphen, a doubled letter, one letter swapped
A different zonename.co instead of name.comThe zone is part of the domain, not a detail
A shortened linkA short address from an unknown serviceYou cannot see the destination before opening it
Swapped link textIt says one thing and leads to anotherHover and read the status bar
The addresses above are invented as illustrations of each trick, not as sites that exist.

Checking in practice

  1. On a computer — hover

    The real address appears in the status bar at the bottom. The link text may say anything at all.

  2. On a phone — long press

    The full address pops up. This is the only way to see it before opening.

  3. Read right to left

    Up to the first single slash. If the name there is unfamiliar, there is nothing more to work out.

  4. Type it yourself instead of clicking

    The most reliable move and the most underrated one. Opening a site from a bookmark or typing the address takes seconds and settles the question entirely.

For what a whole fake page looks like and what to do after typing a password into one, see phishing. For codes in the street, see fake QR codes.

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